Any way of reseeding after only a week after customer put down pre-em? or am I going to have to wait for 6 weeks?

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They recommend 30 days, don't they? Either way, far as I know any type of weed killer (be it pre or post) will interfere with the germination of seed so to put grass seed down now is almost for sure a waste of time and money.

This is one reason I always seed first (no offense to you) because you can treat weeds year-round for the most part, but you shouldn't seed much later than right now.

I'd recommend they wait until fall to make sure, you can tell them there is 0 percent guarantee the seed will germinate if you put it down now and about a 40-60 percent chance it will survive the summer if you put it down near end of may.